I don't have any issue with horse meat being used in food products but it's absolutely unacceptable that it could enter the food chain under the guise of beef, especially given the quality of the meat is obviously an unknown. The UK regulatory bodies responsible have clearly dropped the ball when it comes to food safety. People should have confidence that what is advertised is what's being sold. It's worse for the pork contamination of halal meat, as that is offensive to people's religious beliefs - it would be like mixing meat into a veggie pasty.

As the article mentions, this is likely the work of criminal gangs and not just a minor oversight.